锦州20-2凝析气田南高点油环问题浅析

A simple analysis of the oil ring problem in the southern high reservoir,JZ20-2 condensate field

在早期评价阶段,锦州20-2凝析气田南高点被认为是一个无油环的凝析气藏。南高点S4井初期能够正常生产,但在气井生产和凝析油气分离过程中,凝析油的颜色时有变深,判断南高点凝析气藏是否有油环是气田当时生产研究的难点。利用多种方法对锦州20-2凝析气田南高点油环问题进行了分析,认为南高点存在油环,并且有一定程度的锥进。研究结果为JZ20-2凝析气田气井生产制度的改进以及气田综合调整方案的研究提供了重要依据,总结出的综合判断凝析气藏油环存在的方法也具有借鉴意义。

In the early evaluation stage, the south ern high in JZ20-2 condensate field was believed to be a condensate reservoir without oil ring. Well S4 on this reservoir was initially in normal produc- tion, but its produced condensate often became deeper in color during its production and separata- tion of condensate from gas. Therefore, how to discriminate whether there was an oil ring in the res- ervoir was a difficult point in researching production of the field. This problem has been analyzed by sev eral approaches, indicating the existence of an oil ring with a certain gas coning in the reservoir. These results have provided important evidences for im- provinng the production program and researching the comprehensive adjustment plan in the field, and the approaches to discriminate oil ring are also meaning- ful for the reference of other fields.